Triassic

After the Paleozoic Era ended, the Triassic period started. During this period, the Earth was still recovering from the meteor strikes, volcanic eruptions, and gas traps that defined the Permian extinction. The synapsids were the most common vertebrates around, followed by amphibians and reptiles. However, out of all the animal types, the reptiles would have their biggest moment to flourish; since their return to the water a period ago, the marine reptiles had diversified quite a bit, taking on all shapes, sizes, and diets. As well as this, the archosaurs (reptiles with lighter bones and stronger muscles) had evolved a lot, causing them to be just as diverse as all the other reptiles, and possibly even the synapsids. In fact, there were two kinds of those reptiles: one that would soon give rise to the crocodilians, and one that would soon give rise to the dinosaurs. Meanwhile, an order of smaller synapsids, the cynodonts, would evolve into mammals. Near the end of the period, the non-mammalian synapsids would soon decline, while the dinosaurs would begin to proliferate in preparation for their rule of all the Mesozoic; soon, climate change, rising sea levels, and an asteroid strike would impact the Earth, driving many genera to extinction and giving rise to the Jurassic.

Lasted from 252.17-201.3 mya

Triassic

Early Triassic Animals (note that those are not all the ones that exist)[]

Middle Triassic Animals (note that those are not all the ones that exist)[]

Late Triassic Animals (note that those are not all the ones that exist)[]